From: "Roger Pau Monné" <roger.pau@citrix.com>
To: Jan Beulich <jbeulich@suse.com>
Cc: Manuel Bouyer <bouyer@antioche.eu.org>, <xen-devel@lists.xenproject.org>
Subject: Re: NetBSD dom0 PVH: hardware interrupts stalls
Date: Mon, 23 Nov 2020 10:49:18 +0100 [thread overview]
Message-ID: <20201123094918.xat7oka47nehqsng@Air-de-Roger> (raw)
In-Reply-To: <5e637a72-085d-45b9-aa5c-01e138c81875@suse.com>
On Fri, Nov 20, 2020 at 09:54:42AM +0100, Jan Beulich wrote:
> On 20.11.2020 09:28, Roger Pau Monné wrote:
> > On Fri, Nov 20, 2020 at 09:09:51AM +0100, Jan Beulich wrote:
> >> On 19.11.2020 18:57, Manuel Bouyer wrote:
> >>> I added an ASSERT() after the printf to ket a stack trace, and got:
> >>> db{0}> call ioapic_dump_raw^M
> >>> Register dump of ioapic0^M
> >>> [ 13.0193374] 00 08000000 00170011 08000000(XEN) vioapic.c:141:d0v0 apic_mem_readl:undefined ioregsel 3
> >>> (XEN) vioapic.c:512:vioapic_irq_positive_edge: vioapic_deliver 2
> >>> (XEN) Assertion '!print' failed at vioapic.c:512
> >>> (XEN) ----[ Xen-4.15-unstable x86_64 debug=y Tainted: C ]----
> >>> (XEN) CPU: 0
> >>> (XEN) RIP: e008:[<ffff82d0402c4164>] vioapic_irq_positive_edge+0x14e/0x150
> >>> (XEN) RFLAGS: 0000000000010202 CONTEXT: hypervisor (d0v0)
> >>> (XEN) rax: ffff82d0405c806c rbx: ffff830836650580 rcx: 0000000000000000
> >>> (XEN) rdx: ffff8300688bffff rsi: 000000000000000a rdi: ffff82d0404b36b8
> >>> (XEN) rbp: ffff8300688bfde0 rsp: ffff8300688bfdc0 r8: 0000000000000004
> >>> (XEN) r9: 0000000000000032 r10: 0000000000000000 r11: 00000000fffffffd
> >>> (XEN) r12: ffff8308366dc000 r13: 0000000000000022 r14: ffff8308366dc31c
> >>> (XEN) r15: ffff8308366d1d80 cr0: 0000000080050033 cr4: 00000000003526e0
> >>> (XEN) cr3: 00000008366c9000 cr2: 0000000000000000
> >>> (XEN) fsb: 0000000000000000 gsb: 0000000000000000 gss: 0000000000000000
> >>> (XEN) ds: 0000 es: 0000 fs: 0000 gs: 0000 ss: 0000 cs: e008
> >>> (XEN) Xen code around <ffff82d0402c4164> (vioapic_irq_positive_edge+0x14e/0x150):
> >>> (XEN) 3d 10 be 1d 00 00 74 c2 <0f> 0b 55 48 89 e5 41 57 41 56 41 55 41 54 53 48
> >>> (XEN) Xen stack trace from rsp=ffff8300688bfdc0:
> >>> (XEN) 0000000200000086 ffff8308366dc000 0000000000000022 0000000000000000
> >>> (XEN) ffff8300688bfe08 ffff82d0402bcc33 ffff8308366dc000 0000000000000022
> >>> (XEN) 0000000000000001 ffff8300688bfe40 ffff82d0402bd18f ffff830835a7eb98
> >>> (XEN) ffff8308366dc000 ffff830835a7eb40 ffff8300688bfe68 0100100100100100
> >>> (XEN) ffff8300688bfea0 ffff82d04026f6e1 ffff830835a7eb30 ffff8308366dc0f4
> >>> (XEN) ffff830835a7eb40 ffff8300688bfe68 ffff8300688bfe68 ffff82d0405cec80
> >>> (XEN) ffffffffffffffff ffff82d0405cec80 0000000000000000 ffff82d0405d6c80
> >>> (XEN) ffff8300688bfed8 ffff82d04022b6fa ffff83083663f000 ffff83083663f000
> >>> (XEN) 0000000000000000 0000000000000000 0000000a7c62165b ffff8300688bfee8
> >>> (XEN) ffff82d04022b798 ffff8300688bfe08 ffff82d0402a4bcb 0000000000000000
> >>> (XEN) 0000000000000206 ffff8316da86e61c ffff8316da86e600 ffff938031fd47c0
> >>> (XEN) 0000000000000003 0000000000000400 ff889e8da08f928a 0000000000000000
> >>> (XEN) 0000000000000002 0000000000000100 000000000000b86e ffff93803237f010
> >>> (XEN) 0000000000000000 ffff8316da86e61c 0000beef0000beef ffffffff80555918
> >>> (XEN) 000000bf0000beef 0000000000000046 ffff938031fd4790 000000000000beef
> >>> (XEN) 000000000000beef 000000000000beef 000000000000beef 000000000000beef
> >>> (XEN) 0000e01000000000 ffff83083663f000 0000000000000000 00000000003526e0
> >>> (XEN) 0000000000000000 0000000000000000 0000060100000001 0000000000000000
> >>> (XEN) Xen call trace:
> >>> (XEN) [<ffff82d0402c4164>] R vioapic_irq_positive_edge+0x14e/0x150
> >>> (XEN) [<ffff82d0402bcc33>] F arch/x86/hvm/irq.c#assert_gsi+0x5e/0x7b
> >>> (XEN) [<ffff82d0402bd18f>] F hvm_gsi_assert+0x62/0x77
> >>> (XEN) [<ffff82d04026f6e1>] F drivers/passthrough/io.c#dpci_softirq+0x261/0x29e
> >>> (XEN) [<ffff82d04022b6fa>] F common/softirq.c#__do_softirq+0x8a/0xbf
> >>> (XEN) [<ffff82d04022b798>] F do_softirq+0x13/0x15
> >>> (XEN) [<ffff82d0402a4bcb>] F vmx_asm_do_vmentry+0x2b/0x30
> >>> (XEN)
> >>> (XEN)
> >>> (XEN) ****************************************
> >>> (XEN) Panic on CPU 0:
> >>> (XEN) Assertion '!print' failed at vioapic.c:512
> >>> (XEN) ****************************************
> >>
> >> Right, this was the expected path after what you've sent prior to this.
> >> Which turned my attention back to the 'i' debug key output you had sent
> >> the other day. There we have
> >>
> >> (XEN) IRQ: 34 vec:51 IO-APIC-level status=010 aff:{0}/{0-7} in-flight=1 d0: 34(-MM)
> >>
> >> i.e. at that point we're waiting for Dom0 to signal it's done handling
> >> the IRQ. There is, however, a timer associated with this. Yet that's
> >> actually to prevent the system getting stuck, i.e. the "in-flight"
> >> state ought to clear 1ms later (when that timer expires), and hence
> >> ought to be pretty unlikely to catch when non-zero _and_ something's
> >> actually stuck.
> >
> > I somehow assumed the interrupt was in-flight because the printing to
> > the Xen console caused one to be injected, and thus dom0 didn't had
> > time to Ack it yet.
>
> By "injected" you mean from Xen into Dom0, or by the hardware for Xen
> to handle? (I ask because I think I saw you use the term also for the
> latter case, in some context.) If the former, then something would
> need to have caused Xen to inject it, while in the latter case there
> would need to have been a reason that it didn't get delivered earlier.
Sorry, wrote this in a hurry and didn't realize it could be
misleading. I meant injected from hardware to Xen, which would then
also be injected from Xen to dom0.
I would expect softirqs to be running normally (as you have already
asked and Manuel proved the watchdog is not triggering).
Roger.
next prev parent reply other threads:[~2020-11-23 9:50 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-17 15:09 NetBSD dom0 PVH: hardware interrupts stalls Manuel Bouyer
2020-11-17 15:58 ` Roger Pau Monné
2020-11-17 16:40 ` Manuel Bouyer
2020-11-18 8:57 ` Roger Pau Monné
2020-11-18 9:24 ` Manuel Bouyer
2020-11-18 10:00 ` Roger Pau Monné
2020-11-18 12:14 ` Manuel Bouyer
2020-11-18 14:39 ` Roger Pau Monné
2020-11-18 14:59 ` Jan Beulich
2020-11-19 14:19 ` Roger Pau Monné
2020-11-19 15:57 ` Manuel Bouyer
2020-11-19 16:57 ` Manuel Bouyer
2020-11-19 17:57 ` Manuel Bouyer
2020-11-20 8:09 ` Jan Beulich
2020-11-20 8:28 ` Roger Pau Monné
2020-11-20 8:52 ` Manuel Bouyer
2020-11-20 8:59 ` Jan Beulich
2020-11-20 9:27 ` Manuel Bouyer
2020-11-20 10:00 ` Jan Beulich
2020-11-20 10:38 ` Manuel Bouyer
2020-11-23 9:57 ` Roger Pau Monné
2020-11-23 11:32 ` Manuel Bouyer
2020-11-23 12:51 ` Roger Pau Monné
2020-11-23 14:31 ` Manuel Bouyer
2020-11-23 17:06 ` Roger Pau Monné
2020-11-23 17:39 ` Manuel Bouyer
2020-11-24 10:05 ` Jan Beulich
2020-11-24 12:21 ` Roger Pau Monné
2020-11-24 13:59 ` Manuel Bouyer
2020-11-24 14:09 ` Jan Beulich
2020-11-24 14:27 ` Manuel Bouyer
2020-11-24 14:33 ` Jan Beulich
2020-11-24 14:36 ` Jan Beulich
2020-11-24 14:52 ` Jan Beulich
2020-11-24 15:00 ` Roger Pau Monné
2020-11-24 15:08 ` Manuel Bouyer
2020-11-24 15:49 ` Roger Pau Monné
2020-11-24 16:09 ` Manuel Bouyer
2020-11-26 13:34 ` Roger Pau Monné
2020-11-26 14:16 ` Manuel Bouyer
2020-11-26 14:26 ` Roger Pau Monné
2020-11-26 15:09 ` Roger Pau Monné
2020-11-26 17:20 ` Manuel Bouyer
2020-11-27 10:59 ` Roger Pau Monné
2020-11-27 11:18 ` Jan Beulich
2020-11-27 11:19 ` Manuel Bouyer
2020-11-27 11:21 ` Jan Beulich
2020-11-27 13:10 ` Manuel Bouyer
2020-11-27 13:14 ` Jan Beulich
2020-11-27 13:18 ` Manuel Bouyer
2020-11-27 11:29 ` Jan Beulich
2020-11-27 13:13 ` Manuel Bouyer
2020-11-27 13:18 ` Jan Beulich
2020-11-27 13:31 ` Manuel Bouyer
2020-11-27 13:40 ` Jan Beulich
2020-11-27 13:49 ` Jürgen Groß
2020-11-27 13:59 ` Manuel Bouyer
2020-11-27 20:22 ` Roger Pau Monné
2020-11-27 21:44 ` Manuel Bouyer
2020-11-28 14:53 ` Roger Pau Monné
2020-11-28 17:14 ` Manuel Bouyer
2020-11-29 9:23 ` Manuel Bouyer
2020-11-30 10:00 ` Jan Beulich
2020-11-30 10:28 ` Manuel Bouyer
2020-11-30 11:35 ` Manuel Bouyer
2020-11-30 11:44 ` Jan Beulich
2020-11-30 11:50 ` Manuel Bouyer
2020-11-30 12:09 ` Jan Beulich
2020-11-24 14:42 ` Jan Beulich
2020-11-24 14:59 ` Roger Pau Monné
2020-11-24 15:18 ` Manuel Bouyer
2020-11-24 15:23 ` Jürgen Groß
2020-11-20 8:54 ` Jan Beulich
2020-11-20 9:13 ` Manuel Bouyer
2020-11-23 9:49 ` Roger Pau Monné [this message]
2020-11-18 15:03 ` Manuel Bouyer
2020-11-18 9:16 ` Jan Beulich
2020-11-18 9:28 ` Manuel Bouyer
2020-11-18 9:43 ` Jan Beulich
2020-11-18 10:14 ` Manuel Bouyer
2020-11-18 11:17 ` Jan Beulich
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